/*
 * Created on 19-Sep-2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package org.gudy.azureus2.core3.util;

public class PausableAverage extends Average {
    public static PausableAverage getPausableInstance(int refreshRate, int period) {
        if (refreshRate < 100) {

            return null;
        }

        if ((period * 1000) < refreshRate) {

            return null;
        }

        return new PausableAverage(refreshRate, period);
    }

    private long offset;
    private long pause_time;

    private PausableAverage(int _refreshRate, int _period) {
        super(_refreshRate, _period);
    }

    public void addValue(long value) {
        super.addValue(value);
    }

    public long getAverage() {
        long average = super.getAverage();

        return (average);
    }

    protected long getEffectiveTime() {
        return (SystemTime.getCurrentTime() - offset);
    }

    public void pause() {
        if (pause_time == 0) {

            pause_time = SystemTime.getCurrentTime();
        }
    }

    public void resume() {
        if (pause_time != 0) {

            long now = SystemTime.getCurrentTime();

            if (now > pause_time) {

                offset += now - pause_time;
            }

            pause_time = 0;
        }
    }
}
